#!/usr/bin/env python3

import datetime, json, os.path, sys

base_dir = sys.argv[1]

serial_num = lambda n: f'{today}{n:02}'
today_str = datetime.datetime.utcnow().date().strftime('%Y%m%d')
today = int(today_str)

paths = []

for zone, data in json.load(sys.stdin).items():
    expected_hash = data['expected']

    old_serial_int = data['serial']
    new_serial = serial_num(0)

    if old_serial_int is not None:
        old_serial = str(old_serial_int)
        if len(old_serial) > len(new_serial):
            new_serial = None
        elif len(old_serial) == len(new_serial):
            old_day = int(old_serial[:len(today_str)]) 
            if old_day >= today:
                new_serial = None

        if new_serial is None:
            new_serial = str(old_serial_int + 1)

    path = os.path.join(base_dir, zone, 'serial.nix')
    with open(os.path.join(base_dir, zone, 'serial.nix'), 'w') as serial_file:
        print(f'''\
{{
  config = {{
    soa.serial = {new_serial};
    nullSerialHash = "{expected_hash}";
  }};
}}
''', file=serial_file)
        paths.append(path)

# Se imprime al final para evitar estados intermedios si algo tira excepción
for path in paths:
    print(path)